Add a border around histogram bars in Matplotlib

Last Updated : 24 Jan, 2021

Prerequisites: Matplotlib

In this article, we will see how can we can add a border around histogram bars in our graph using matplotlib, Here we will take two different examples to showcase our graph.

Approach:

Import required module.
Create data.
Add border around histogram bars.
Normally plot the data.
Display plot.

Below is the Implementation:

Example 1:

In this example, we will Pass an edgecolor = ‘Black’ value as the edge color parameter to plt.hist() to change the bar border color.

Python3

# importing package 
from matplotlib import pyplot as plt 
import numpy as np 
  
#create data 
fig,ax = plt.subplots(1,1) 
a = np.array([22, 87, 5, 43, 56, 73, 55, 
              54, 11, 20, 51, 5, 79, 31, 27]) 
  
b = (0, 25, 50, 75, 100) 
  
# Adjust the border color 
ax.hist(a, b, edgecolor = "black") 
  
ax.set_title("histogram - Geekforgeeks") 
ax.set_xlabel('Litracy Level(%)') 
ax.set_ylabel('Population(million)') 
  
plt.show()

Output:

Example 2:

In this example, we will Pass a two edge color, edgecolor = ‘Black’ and ‘red’ value as the edge color parameter to plt.hist() to change the bar border color.

Python3

# importing package 
from matplotlib import pyplot as plt 
import numpy as np 
  
#create data 
fig,ax = plt.subplots(1, 1) 
  
a = np.array([20, 73, 55, 31, 51, 5, 79, 5, 
              43, 22, 87, 54, 11, 56, 27]) 
  
b = np.array([0, 25, 50, 75, 100]) 
  
# Adjust the border color 
ax.hist(a, edgecolor = "black", color = 'pink') 
ax.hist(b, edgecolor = "red", color = 'gray') 
  
ax.set_title("Histogram - Geekforgeeks") 
plt.show()